/// <reference types="node" />
export type ValidateImageTypeOptions = {
    /**
     * Original file name
     * if the `filePath` is temporary random file path, validator use the `originalFilename` instead of `filePath`
     */
    originalFilename?: string;
    /**
     * Allow mime-type lists
     * Example ['image/jpeg', 'image/gif', 'image/png', 'image/svg+xml']
     */
    allowMimeTypes: string[];
};
export type ValidateImageResult = {
    ok: boolean;
    error?: Error;
};
/**
 * Detect the image type of Buffer or Uint8Array
 * This check is based on https://github.com/sindresorhus/image-type
 */
export declare function validateBufferMIMEType(buffer: Buffer, options: ValidateImageTypeOptions): Promise<ValidateImageResult>;
/**
 * Detect the image type of filePath
 * @example
 *
 * ```
 * const validationResult = validateMIMEType("test.png", {
 *     allowMimeTypes: ['image/jpeg', 'image/gif', 'image/png', 'image/svg+xml']
 * });
 * if(validationResult) {
 *   console.error(validationResult)
 * }
 * ```
 */
export declare function validateMIMEType(filePath: string, options: ValidateImageTypeOptions): Promise<ValidateImageResult>;